Google, which famously offered to buy Groupon for $6 billion and was rebuffed, ponied up $100 million for Dealmap — a rich price for a much smaller startup in the same daily deals space, according to Sam Hamadeh, CEO of PrivCo.

Dealmap, a San Francisco startup that aggregates offers from Groupon and similar sites, announced its sale earlier this month but didn’t disclose the price.

The price represents a rich premium for a site that has about 2 million registered users, compared to Groupon’s 115 million. Dealmap was worth about $20 million only a few months ago, Hamadeh said.

In a much bigger deal, Google ponied up $12.5 billion, or $40 a share, for Motorola Mobility — a 63 percent premium to the cellphone maker’s closing price.

Google threw down the $100 million for similar reasons it went so big on its Motorola offer: “To get the deal done and get it done fast,” Hamadeh said.